chromium/content/test/data/accessibility/html/ins-expected-mac.txt

AXWebArea
++AXGroup
++++AXStaticText AXValue='My favorite browser is '
++++AXGroup AXSubrole=AXDeleteStyleGroup
++++++AXStaticText AXValue='ABC'
++++AXStaticText AXValue=' '
++++AXGroup AXSubrole=AXInsertStyleGroup
++++++AXStaticText AXValue='Chrome'
++++AXStaticText AXValue='!'